Project info for jbig2dec

This is a project to create a free decoder library and tool for the JBIG2 bi-level (1 bpp) image compression format. It was sort of designed as a next-generation fax format, but it's so complicated it will probably only be used for scanned document databases where there's a 32-bit host to interpret. Adobe did an inclusion-by-reference into PDF 1.4, so we'll eventually glue this into Ghostscript to support those files